WO2024087037A1

WO2024087037A1 - Welding machine, welding gun, welding system, and welding gun control method

Info

Publication number: WO2024087037A1
Application number: PCT/CN2022/127501
Authority: WO
Inventors: 潘磊; 泰尔佐·毛里齐奥; 李志岗
Original assignee: 深圳市佳士科技股份有限公司; 佳士科技欧洲有限责任公司
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2024-05-02
Also published as: AU2022483841A1; CN116075384A

Abstract

A welding system, comprising a welding machine (200) and a welding gun (300) that establish an electrical signal connection. The welding machine establishes an electrical signal connection with the welding gun by means of a wire, supplies power to the welding gun by using the electrical signal connection, according to an electrical signal received from the welding gun, identifies a type of the welding gun, obtains a welding gun type identification result, and according to the welding gun type identification result, self-adaptively adjusts a specific function of the welding gun. The welding system can enable the welding gun to have three welding gun control functions of conventional common-legacy mode control, analog control, and digital control without needing to add additional cables for the welding machine and the welding gun or improve the existing cable designs of conventional welding guns. The present invention further relates to a welding machine, a welding gun, and a welding gun control method.

Description

Welding machine, welding gun, welding system and welding gun control method

Technical Field

The present application relates to the technical field of welding guns, and more specifically, to a welding machine, a welding gun, a welding system and a welding gun control method.

Background technique

A conventional welding gun usually has two wires connected to the switch button of the welding gun. In order to realize the digital control function of the welding gun, it is necessary to solve the problem of data communication and transmission of power supply voltage signals between the welding machine (also known as welding cabinet) and the welding gun, which requires the addition of some additional wires. In the prior art, in order to realize a digital welding gun, it is necessary to improve the internal cables of the welding machine and the conventional welding gun, and set additional wires in the welding machine and the conventional welding gun, so as to transmit data and power supply voltage signals between the welding machine and the welding gun through the additional wires, thereby providing a digital control function for the welding gun. However, this will also make the welding machine an exclusive or customized welding machine, resulting in the loss of compatibility of the welding machine, and also resulting in the improved welding gun being only suitable for such exclusive or customized welding machine.

Therefore, how to achieve standard, analog and digital control of welding guns without changing the internal cable design of welding machines and traditional welding guns has become a technical problem that needs to be solved urgently in the industry.

technical problem

The technical problem to be solved by the present application is to provide an improved welding machine, welding gun, welding gun control method and welding system in view of the above-mentioned defects of the prior art, which can cleverly utilize the two existing wires of the traditional welding gun as power supply cables and electrical signal transmission cables without changing the internal cable design of the welding machine and the traditional welding gun, and at the same time realize the traditional ordinary conventional mode control, analog control and digital control of the welding gun.

Technical Solutions

The technical solutions adopted by this application to solve the above technical problems are as follows:

In a first aspect, a welding system includes a welder and a welding gun that establish an electrical signal connection, the welder being used to power the welding gun through the electrical signal connection established between the welding gun and the welder and to identify the type of the welding gun according to the electrical signal received from the welding gun, thereby obtaining a welding gun type identification result, and adaptively adjusting a specific function of the welding gun according to the welding gun type identification result.

In a preferred embodiment of the first aspect, the welding gun includes a welding gun control circuit, the welding gun control circuit includes a welding gun type identification circuit installed in the welding gun handle, and an input circuit connected between the welding gun type identification circuit and the welding machine;

The input circuit includes a first wire and a second wire for establishing the electrical signal connection between the welding gun and the welding machine; wherein one end of the first wire and the second wire are connected to a welding gun port for connecting to the welding machine, and the other end of the first wire and the second wire are connected to an input port of the input circuit.

In a preferred embodiment of the first aspect, the welding gun type identification circuit includes a first slot for accommodating an analog plug-in module and a second slot for accommodating a digital plug-in module;

The welding machine is specifically used to trigger an identification operation of a welding gun type of the welding gun according to the insertion status of the first slot and the second slot, obtain a welding gun type identification result by looking up a table, and adaptively adjust a specific function of the welding gun according to the welding gun type identification result.

In a preferred embodiment of the first aspect, the welding machine is specifically used for:

checking whether an electrical signal from the welding gun type identification circuit is received;

If the electrical signal from the welding gun type identification circuit is received, a first welding gun type identification result is obtained according to the electrical signal and a pre-stored first correspondence table, the welding gun is identified as a digital welding gun, and the welding gun is switched to a digital control mode;

If no electrical signal is received from the welding gun type identification circuit, it is checked whether there is a resistance value between the first wire and the second wire, and the resistance value between the first wire and the second wire is read; if the resistance value between the first wire and the second wire is read, and the resistance value is within a preset resistance value range, a table lookup is performed according to the measured resistance value and a pre-stored second correspondence table to obtain a second welding gun type identification result corresponding to the measured resistance value, and the analog control mode is switched; if the resistance value between the first wire and the second wire is read, and it is confirmed that the resistance value exceeds the preset resistance value range, it is confirmed that the welding gun does not belong to the category of a specific product model/series, and the identification operation of the welding gun type of the welding gun is not triggered, and the adaptive adjustment operation of the specific function of the welding gun is not performed;

The second correspondence table includes a one-to-one correspondence between the resistance value between the first wire and the second wire and various simulated welding gun types.

In a preferred embodiment of the first aspect, the welding machine is also used to identify the welding gun as an ordinary welding gun when neither the analog plug-in module inserted into the first slot nor the digital plug-in module inserted into the second slot is detected, so that the welding gun operates in a traditional ordinary mode.

In a preferred embodiment of the first aspect, the welding gun type identification circuit has a first slot for accommodating an analog plug-in module and a second slot for accommodating a digital plug-in module, and is configured to be identified by the welding machine through an electrical signal between the first wire and the second wire when the analog plug-in module inserted into the first slot is detected or the digital plug-in module inserted into the second slot is detected.

In a preferred implementation of the first aspect, the input circuit comprises:

A filter subcircuit, the filter subcircuit is used to filter the power supply voltage signal provided by the welding machine;

A rectifier circuit, the rectifier circuit is used to rectify the power supply voltage signal and output a DC voltage;

A voltage stabilizing subcircuit, the voltage stabilizing subcircuit is used to read an average voltage value of the DC voltage output by the rectifier subcircuit, determine whether the average voltage value reaches a preset DC voltage threshold, and interrupt the voltage signal transmission between the input circuit and the welding gun type identification circuit when the average voltage value is lower than the preset DC voltage threshold; the voltage stabilizing subcircuit is also used to resume the voltage signal transmission between the input circuit and the welding gun type identification circuit when it is detected that the DC voltage output by the rectifier subcircuit reaches the preset DC voltage threshold again;

A key sub-circuit is connected to a welding gun switch through the first wire and the second wire.

In a second aspect, the present application proposes a welding machine, which establishes an electrical signal connection with the welding gun through a first wire and a second wire, and is used to power the welding gun through the electrical signal connection and identify the type of the welding gun according to the electrical signal received from the welding gun, obtain a welding gun type identification result, and adaptively adjust the specific function of the welding gun according to the welding gun type identification result.

In a preferred embodiment of the second aspect, one end of the first wire and the second wire are connected to a welding gun port for connecting to the welding machine, and the other end of the first wire and the second wire are connected to an input circuit of the welding gun.

In a preferred embodiment of the second aspect, the welding machine is specifically used to trigger an identification operation of a welding gun type of the welding gun according to the insertion status of the first slot and the second slot of the welding gun, obtain a welding gun type identification result by looking up a table, and adaptively adjust a specific function of the welding gun according to the welding gun type identification result.

In a preferred embodiment of the second aspect, the welding machine is specifically used for:

checking whether an electrical signal from the welding gun is received;

If the electrical signal from the welding gun type is received, a first welding gun type identification result is obtained according to the electrical signal and a pre-stored first correspondence table, the welding gun is identified as a digital welding gun, and the control mode is switched to a digital control mode;

If no electrical signal from the welding gun is received, it is checked whether there is a resistance value between the first wire and the second wire, and the resistance value between the first wire and the second wire is read; if the resistance value between the first wire and the second wire is read, and it is determined that the resistance value is within a preset resistance value range, a table lookup is performed according to the measured resistance value and a pre-stored second correspondence table to obtain a second welding gun type identification result corresponding to the measured resistance value, and the control mode is switched to an analog control mode; if the resistance value between the first wire and the second wire is read, and it is confirmed that the resistance value exceeds the preset resistance value range, it is confirmed that the welding gun does not belong to a welding gun within the scope of a specific product model/series, and the identification operation of the welding gun type of the welding gun is not triggered, and the adaptive adjustment operation of the specific function of the welding gun is not performed;

In a preferred embodiment of the second aspect, the welding machine is also used to identify the welding gun as an ordinary welding gun when neither the analog plug-in module inserted into the first slot of the welding gun nor the digital plug-in module inserted into the second slot of the welding gun is detected, so that the welding gun operates in a traditional ordinary mode.

In a third aspect, the present application further provides a welding gun, the welding gun comprising a welding gun control circuit, characterized in that the welding gun control circuit comprises a welding gun type identification circuit installed in a welding gun handle, and an input circuit connected between the welding gun type identification circuit and a welding machine;

Wherein, the input circuit includes a first wire and a second wire for establishing an electrical signal connection between the welding gun and the welding machine;

The welding gun type identification circuit has a first slot for accommodating an analog plug-in module and a second slot for accommodating a digital plug-in module, and is used to be identified by the welding machine through an electrical signal between the first wire and the second wire when the analog plug-in module inserted into the first slot is detected or the digital plug-in module inserted into the second slot is detected.

In a preferred embodiment of the third aspect, one end of the first wire and the second wire are connected to a welding gun port for connecting to the welding machine, and the other end of the first wire and the second wire are connected to an input port of the input circuit.

In a preferred embodiment of the third aspect, the welding gun type identification circuit further has an interface electrically connected to the analog plug-in module inserted into the first slot or the digital plug-in module inserted into the second slot.

In a fourth aspect, the present application further proposes a welding gun control method, wherein the welding gun control method is implemented on a welding machine, the welding gun comprises a welding gun control circuit, the welding gun control circuit comprises a welding gun type identification circuit installed in a welding gun handle, and an input circuit, the input circuit has a first wire and a second wire for establishing an electrical signal connection between the welding machine and the welding gun, the welding gun type identification circuit has a first slot for accommodating an analog plug-in module and a second slot for accommodating a digital plug-in module; characterized in that the method comprises the following steps:

The welding gun is powered by utilizing the electrical signal connection established between the welding machine and the welding gun and the type of the welding gun is identified according to the electrical signal received from the welding gun, thereby obtaining a welding gun type identification result, and adaptively adjusting the specific function of the welding gun according to the welding gun type identification result.

In a preferred implementation manner of the fourth aspect, the step of identifying the type of the welding gun according to the electrical signal received from the welding gun, obtaining a welding gun type identification result, and adaptively adjusting a specific function of the welding gun according to the welding gun type identification result comprises:

When the analog plug-in module inserted into the first slot is detected or the digital plug-in module inserted into the second slot is detected, an identification operation of the welding gun type of the welding gun is triggered, a welding gun type identification result is obtained by looking up a table, and a specific function of the welding gun is adaptively adjusted according to the welding gun type identification result.

In a preferred implementation manner of the fourth aspect, when the analog plug-in module inserted into the first slot is detected or the digital plug-in module inserted into the second slot is detected, triggering an identification operation of the welding gun type of the welding gun, obtaining a welding gun type identification result by looking up a table, and adaptively adjusting a specific function of the welding gun according to the welding gun type identification result specifically includes:

In a preferred implementation manner of the fourth aspect, the step of identifying the type of the welding gun according to the electrical signal received from the welding gun, obtaining a welding gun type identification result, and adaptively adjusting a specific function of the welding gun according to the welding gun type identification result further includes:

If neither the analog plug-in module inserted into the first slot and electrically connected to the welding gun type identification circuit nor the digital plug-in module inserted into the second slot and electrically connected to the welding gun type identification circuit is detected, the welding gun is operated in the traditional normal mode.

In a preferred implementation of the fourth aspect, the step of powering the welding gun through the electrical signal connection comprises:

Performing filtering processing on the power supply voltage signal provided by the welding machine through the filtering subcircuit of the input circuit;

Rectifying the power supply voltage signal through the rectifier circuit of the input circuit to output a DC voltage; and

The average voltage value of the DC voltage output by the rectifier subcircuit is read by the voltage stabilizing subcircuit of the input circuit to determine whether the average voltage value reaches a preset DC voltage threshold value, and when the average voltage value is lower than the preset DC voltage threshold value, the voltage signal transmission between the input circuit and the welding gun type identification circuit is interrupted until it is detected that the DC voltage output by the rectifier subcircuit reaches the preset DC voltage threshold value again, and the voltage signal transmission between the input circuit and the welding gun type identification circuit is restored.

Beneficial Effects

The welding machine, welding gun, welding gun control method and welding system proposed in this application have at least the following beneficial effects:

First, the first wire/second wire connected between the welder and the welding gun is used to transmit the power supply voltage signal provided by the welder to power the welding gun type identification circuit. In addition, the first wire and the second wire are used to receive and transmit electrical signals. Therefore, there is no need to add additional wires to the welder or the traditional welding gun or change their internal wire design. Therefore, by applying the welder, welding gun, welding gun control method and welding system proposed in this application, the welder can be compatible with all types of welding guns.

Second, since the welding gun control circuit of the present application is provided with corresponding slots, the user can replace different intelligent control components (i.e., analog plug-in modules and digital plug-in modules) for the welding gun according to the needs of the welding gun function, so that the welding gun has the function corresponding to the inserted intelligent control component. The welding machine can trigger the welding gun type identification circuit to identify the welding gun type of the welding gun according to the insertion conditions of the first slot and the second slot, obtain accurate welding gun type identification results by looking up the table, and adaptively adjust the specific functions of the welding gun according to the obtained welding gun type identification results. Therefore, the user can replace different intelligent control components for the welding gun according to the functional needs of the welding gun to make the welding gun have different control functions, and can make the welding gun work in any of the traditional ordinary mode, analog control mode and digital control mode, provide users with various functions, and well meet the diverse needs of different users.

3. The welding machine proposed in this application has excellent compatibility. The welding machine is not only compatible with various types of welding guns, but also can simultaneously identify three welding guns connected to the welding machine.

4. Provide a voltage stabilization protection mechanism for the welding gun. Specifically, the voltage stabilization function provided by the voltage stabilization subcircuit of the input circuit of the welding gun can optimize the signal transmission between the welding machine and the input circuit of the welding machine control circuit when the power supply voltage provided by the welding machine is undervoltage, thereby ensuring that a stable operating voltage can be provided for the welding gun type identification circuit, thereby improving the working stability of the entire welding gun control circuit.

BRIEF DESCRIPTION OF THE DRAWINGS

The welding machine, welding gun, welding gun control method and welding system of the present application are described below in conjunction with the accompanying drawings and specific implementation methods, wherein:

FIG1 is a structural block diagram of a welding system provided by a preferred embodiment of the present application;

FIG2 is a structural block diagram of a welding gun control circuit with an analog plug-in module inserted, provided by a preferred embodiment of the present application;

FIG3 is a structural block diagram of a welding gun control circuit with a digital plug-in module inserted, provided in a preferred embodiment of the present application;

FIG4 is a circuit diagram of a welding gun control circuit with a digital plug-in module inserted, provided in a preferred embodiment of the present application;

FIG5 is a structural block diagram of an input circuit of a welding gun control circuit provided in a preferred embodiment of the present application;

FIG6 is a flow chart of a welding gun control method provided by a preferred embodiment of the present application;

FIG. 7 is a specific implementation flow chart of the voltage stabilization protection scheme included in the welding gun control method shown in FIG. 6 ; and

FIG. 8 is a flowchart of a specific implementation of the welding gun type identification solution included in the welding gun control method shown in FIG. 6 .

Embodiments of the present invention

In order to make the purpose, technical solution and technical effect of this application clearer, the following further describes this application in detail in conjunction with the accompanying drawings and specific implementation methods. It should be understood that the specific implementation methods described in this specification are only for explaining this application, not for limiting this application.

In order to solve the problem in the prior art that in order to realize a digital welding gun 300 based on digital control, it is necessary to improve the internal cables of the welding machine 200 and the traditional welding gun 300, and set additional wires in the welding machine 200 and the traditional welding gun 300, so as to transmit data and power supply voltage signals between the welding machine 200 and the welding gun 300 through the additional wires, so as to realize digital control of the welding gun 300, which will make the welding machine 200 become an exclusive or customized welding machine 200, resulting in the welding machine 200 losing its compatibility, and also resulting in the technical defect that the improved welding gun 300 can only be adapted to such an exclusive or customized welding machine 200. The innovation of the present application is:

First, the first wire and the second wire are used to establish an electrical signal connection between the welding machine 200 and the welding gun 300 to transmit the power supply voltage signal provided by the welding machine 200 to power the welding gun 300. The first wire and the second wire are also used to receive and transmit signals, so there is no need to add additional wires to the welding machine 200 or the traditional welding gun 300 or change the internal wire design. Therefore, by applying the welding gun control circuit 100 proposed in this application, the welding machine 200 can be compatible with all types of welding guns 300.

Second, a corresponding slot is provided on the welding gun control circuit 100 of the welding gun 300 so that the user can replace different intelligent control components (i.e., the analog plug-in module 103 and the digital plug-in module 104) for the welding gun 300 according to the functional requirements of the welding gun 300, so that the welding gun 300 has functions corresponding to the inserted intelligent control components. Therefore, the user can replace different intelligent control components for the welding gun 300 according to the functional requirements of the welding gun 300 to enable the welding gun 300 to have different control functions, and can enable the welding gun 300 to work in any of the traditional common mode, analog control mode and digital control mode, providing users with various functions and meeting the diverse needs of different users.

3. The welding gun control circuit 100 has a voltage stabilization protection mechanism, that is, the voltage stabilization regulation function provided by the voltage stabilization subcircuit 1013 of the input circuit 101 can optimize the signal transmission between the welding machine 200 and the input circuit 101 of the welding gun control circuit 100 when the power supply voltage provided by the welding machine 200 is undervoltage, thereby ensuring that a stable operating voltage can be provided for the welding gun type identification circuit 102, thereby improving the working stability of the entire welding gun control circuit 100.

The present application will be described in detail below with reference to the accompanying drawings and specific embodiments:

Embodiment 1

As shown in FIG1 , the present application proposes a welding system 1000, which is used to identify the welding gun type of the welding gun 300 by using two wires connected between the welding gun 300 and the welding machine 200, and adaptively adjust the function of the welding gun 300 according to the welding gun type identification result, so that the welding gun 300 works in the traditional normal mode or the analog control mode or the digital control mode, thereby realizing the functions of the ordinary welding gun 300, the analog welding gun 300 and the digital welding gun 300 respectively.

Specifically, the welding system 1000 includes a welding machine 200 and a welding gun 300 that establish an electrical signal connection. The welding machine 200 is used to power the welding gun 300 through the electrical signal connection established between the welding gun 300 and the welding machine 200, and to identify the type of the welding gun 300 according to the electrical signal received from the welding gun 300, to obtain a welding gun type identification result, and to adaptively adjust the specific function of the welding gun 300 according to the welding gun type identification result.

Preferably, the welding gun 300 includes a welding gun control circuit 100 , which includes a welding gun type identification circuit 102 installed in a welding gun handle, and an input circuit 101 connected between the welding gun type identification circuit 102 and the welding machine 200 .

The input circuit 101 includes a first wire and a second wire for establishing an electrical signal connection between the welding gun 300 and the welding machine 200; wherein one end of the first wire and the second wire are connected to the welding gun port for connecting to the welding machine 200, and the other ends of the first wire and the second wire are connected to the input port of the input circuit 101.

Preferably, the welding gun type identification circuit 102 further includes a first slot for accommodating an analog plug-in module 103 and a second slot for accommodating a digital plug-in module 104 .

Among them, the welding machine 200 is specifically used to trigger the identification operation of the welding gun type of the welding gun 300 according to the insertion status of the first slot and the second slot, obtain the welding gun type identification result by looking up the table, and adaptively adjust the specific function of the welding gun 300 according to the welding gun type identification result.

Preferably, the welding machine 200 is specifically used to: check whether an electrical signal from the welding gun type identification circuit 102 is received; if the electrical signal from the welding gun type identification circuit 102 is received, obtain a first welding gun type identification result according to the electrical signal and a pre-stored first correspondence table, identify the welding gun 300 as a digital welding gun 300, and switch to a digital control mode; if the electrical signal from the welding gun type identification circuit 102 is not received, check whether there is a resistance value between the first wire and the second wire, and read the resistance value between the first wire and the second wire; if the resistance value between the first wire and the second wire is read When a resistance value exists and the resistance value is within a preset resistance value range, a table lookup is performed according to the measured resistance value and a pre-stored second correspondence table to obtain a second welding gun type identification result corresponding to the measured resistance value, and the analog control mode is switched to; if the resistance value between the first wire and the second wire is read and it is confirmed that the resistance value exceeds the preset resistance value range, it is confirmed that the welding gun 300 does not belong to the welding gun 300 of the specific product model/series, and the identification operation of the welding gun type of the welding gun 300 is not triggered, and the adaptive adjustment operation of the specific function of the welding gun 300 is not performed.

Table a shows the one-to-one correspondence between the resistance value between the first wire and the second wire and various simulated welding gun types, as shown below:

电阻值（欧姆） Resistance value (ohms)	焊枪300产品系列 Welding gun 300 product series	焊枪类型 Welding gun type	具体型号 Specific model
＞10000 ＞10000	传统焊枪300 Traditional welding gun 300	传统 Tradition	无 none
6800 6800	模拟 TER 系列 Analog TER series	模拟 Simulation	Gas 250A Gas 250A
10000 10000	模拟 TER系列 Analog TER series	模拟 Simulation	Gas 350A Gas 350A
2700 2700	模拟Evolve系列 Simulation Evolve Series	模拟 Simulation	Gas 250A Gas 250A
1500 1500	模拟Evolve系列 Simulation Evolve Series	模拟 Simulation	Gas 350A Gas 350A
1000 1000	模拟Evolve系列 Simulation Evolve Series	模拟 Simulation	Gas 500A Gas 500A
680 680	模拟Evolve系列 Simulation Evolve Series	模拟 Simulation	Water 350A Water 350A
470 470	模拟Evolve系列 Simulation Evolve Series	模拟 Simulation	Water 500A Water 500A
330 330	模拟Evolve系列 Simulation Evolve Series	模拟 Simulation	special 300A special 300A
220 220	模拟Evolve系列 Simulation Evolve Series	模拟 Simulation	special 400A special 400A
150 150	模拟Evolve系列 Simulation Evolve Series	模拟 Simulation	special 500A special 500A

Preferably, the welding machine 200 is also used to identify the welding gun 300 as a common welding gun 300 when neither the analog plug-in module 103 inserted into the first slot nor the digital plug-in module 104 inserted into the second slot is detected, so that the welding gun 300 operates in the conventional common mode.

Preferably, the welding gun type identification circuit 102 has a first slot for accommodating an analog plug-in module 103 and a second slot for accommodating a digital plug-in module 104, and is configured to be identified by the welding machine 200 through an electrical signal between the first wire and the second wire when the analog plug-in module 103 inserted into the first slot is detected or the digital plug-in module 104 inserted into the second slot is detected.

Preferably, the input circuit 101 comprises:

A filter subcircuit 1011, the filter subcircuit 1011 is used to filter the power supply voltage signal provided by the welding machine 200;

A rectifier circuit 1012, the rectifier circuit 1012 is used to rectify the power supply voltage signal and output a DC voltage;

The voltage stabilizing subcircuit 1013 is used to: read the average voltage value of the DC voltage output by the rectifier subcircuit 1012, determine whether the average voltage value reaches a preset DC voltage threshold, and interrupt the voltage signal transmission between the input circuit 101 and the welding gun type identification circuit 102 when the average voltage value is lower than the preset DC voltage threshold; and resume the voltage signal transmission between the input circuit 101 and the welding gun type identification circuit 102 when it is detected that the DC voltage output by the rectifier subcircuit 1012 reaches the preset DC voltage threshold again;

The key sub-circuit 1014 is connected to the welding gun switch through a first wire and a second wire.

Embodiment 2

Corresponding to the above-mentioned welding system 1000, the present application also proposes a welding machine 200. The welding machine 200 includes but is not limited to a MIG welding torch, a TIG welding torch, a plasma cutting torch, a plasma welding torch and other similar welding cabinets.

Among them, the welding machine 200 establishes an electrical signal connection with the welding gun 300 through the first wire and the second wire, and 200 is used to power the welding gun 300 through the electrical signal connection and identify the type of the welding gun 300 according to the electrical signal received from the welding gun 300, obtain the welding gun type identification result, and adaptively adjust the specific function of the welding gun 300 according to the welding gun type identification result.

One end of the first wire and the second wire are both connected to the welding gun port for connecting to the welding machine 200 , and the other ends of the first wire and the second wire are both connected to the input circuit 101 of the welding gun 300 .

The above-mentioned welding machine 200 is specifically used to trigger the identification operation of the welding gun type of the welding gun 300 according to the insertion status of the first slot and the second slot of the welding gun 300, obtain the welding gun type identification result by looking up the table, and adaptively adjust the specific function of the welding gun 300 according to the welding gun type identification result.

Preferably, the welding machine 200 is specifically used for:

Check whether an electrical signal from the welding gun 300 is received;

If an electrical signal from the welding gun type is received, a first welding gun type identification result is obtained according to the electrical signal and a pre-stored first correspondence table, the welding gun 300 is identified as a digital welding gun 300, and the mode is switched to digital control;

If no electrical signal is received from the welding gun 300, it is checked whether there is a resistance value between the first wire and the second wire, and the resistance value between the first wire and the second wire is read; if the resistance value between the first wire and the second wire is read, and it is determined that the resistance value is within the preset resistance value range, a table lookup is performed according to the measured resistance value and a pre-stored second correspondence table to obtain a second welding gun type identification result corresponding to the measured resistance value, and the analog control mode is switched; if the resistance value between the first wire and the second wire is read, and it is confirmed that the resistance value exceeds the preset resistance value range, it is confirmed that the welding gun 300 does not belong to the welding gun 300 of the specific product model/series, and the identification operation of the welding gun type of the welding gun 300 is not triggered, and the adaptive adjustment operation of the specific function of the welding gun 300 is not performed.

The second correspondence table includes a one-to-one correspondence between the resistance value between the first wire and the second wire and various simulated welding gun types (as shown in Table a above).

Embodiment 3

Corresponding to the welding system 1000 disclosed in the first embodiment, the present application also proposes a welding gun 300, which includes a welding gun control circuit 100. Specifically, the welding gun control circuit 100 includes a welding gun type identification circuit 102 installed in a welding gun handle, and an input circuit 101 connected between the welding gun type identification circuit 102 and the welding machine 200.

The input circuit 101 includes a first wire and a second wire for establishing an electrical signal connection between the welding gun 300 and the welding machine 200 .

The welding gun type identification circuit 102 has a first slot for accommodating an analog plug-in module 103 and a second slot for accommodating a digital plug-in module 104, and is used to have the function of being identified by the welding machine 200 through the electrical signal between the first wire and the second wire when the analog plug-in module 103 inserted into the first slot is detected or the digital plug-in module 104 inserted into the second slot is detected.

Preferably, one end of the first wire and the second wire are both connected to a welding gun port for connecting to the welding machine 200 , and the other ends of the first wire and the second wire are both connected to an input port of the input circuit 101 .

Preferably, the welding gun type identification circuit 102 also has an interface electrically connected to the analog plug-in module 103 inserted into the first slot or the digital plug-in module 104 inserted into the second slot.

Since a first slot for accommodating an analog plug-in module 103 and a second slot for accommodating a digital plug-in module 104 are provided in the welding gun type identification circuit 102, the user can choose to insert the analog plug-in module 103 into the first slot to implement the analog control function of the welding gun 300 as needed, or choose to replace the analog plug-in module 103 with a digital plug-in module 104 (i.e., choose to insert the digital plug-in module 104 into the second slot) to implement the digital control function of the welding gun 300.

Preferably, the input circuit 101 comprises:

A voltage stabilizing subcircuit 1013, the voltage stabilizing subcircuit 1013 is used to read the average voltage value of the DC voltage output by the rectifier subcircuit 1012, determine whether the average voltage value reaches a preset DC voltage threshold, and interrupt the signal transmission between the input circuit 101 and the welding gun type identification circuit 102 when the average voltage value is lower than the preset DC voltage threshold, until the DC voltage output by the rectifier subcircuit 1012 reaches the preset DC voltage threshold, and then resume the signal transmission between the input circuit 101 and the welding gun type identification circuit 102;

Therefore, through the above-mentioned input circuit 101, a voltage stabilization protection mechanism is provided for the welding gun 300. Through the voltage stabilization regulation function provided by the voltage stabilization subcircuit 1013 of the input circuit 101, the signal transmission between the welding machine 200 and the input circuit 101 of the welding gun control circuit 100 can be optimized when the power supply voltage provided by the welding machine 200 is undervoltage, thereby ensuring that a stable operating voltage can be provided for the welding gun type identification circuit 102, and improving the working stability of the entire welding gun control circuit 100.

The following describes the structure and implementation principle of the simulated welding gun 300.

In a preferred embodiment of the present application, a structural block diagram of a welding gun control circuit 100 of a welding gun 300 in a simulation control mode is shown (as shown in FIG2 ). Specifically, when a simulation plug-in module 103 is inserted into the first slot of the welding gun control circuit 100 , the welding machine 200 can identify the welding gun 300 as a simulation welding gun 300 having a simulation user interface and simulation control functions.

Preferably, one end of the first wire and the second wire of the input circuit 101 are both connected to the welding machine 200, and the other ends of the first wire and the second wire of the input circuit 101 are both connected to the input end of the input circuit 101. In addition, the welding gun type identification circuit 102 also has an interface, which is electrically connected to the analog plug-in module 103 inserted into the first slot or the digital plug-in module 104 inserted into the second slot. Wherein, when the interface is not connected to any analog plug-in module 103 or digital plug-in module 104, the interface has a closed wiring harness. When the interface needs to be connected to the analog plug-in module 103 or the digital plug-in module 104, the closed wiring harness is removed. With this output interface design, it is convenient for the user to replace the analog plug-in module 103 or the digital plug-in module 104 on the slot of the welding gun type identification circuit 102, thereby switching the welding gun 300 to an analog welding gun 300 or a digital welding gun 300.

The first welding gun type identification result at least includes the product series to which the welding gun belongs, the welding gun type and the welding gun model. The first correspondence table is used to reflect the one-to-one correspondence between the resistance value between the first wire and the second wire and various simulated welding gun types (as shown in Table a above).

The following is an introduction to the structure and implementation principle of the digital welding gun 300

In another preferred embodiment of the present application, a structural block diagram of a welding gun control circuit 100 of a welding gun 300 in a digital control mode is shown (as shown in FIG3 ). As shown in FIG3 , a digital plug-in module 104 is inserted into the second slot of the welding gun control circuit 100. At this time, the welding machine 200 can identify the welding gun 300 as a digital welding gun 300 with a digital user interface and digital control functions. FIG4 further shows a circuit diagram of the welding gun control circuit 100.

The following describes the structure and implementation principle of a conventional welding gun 300 operating in a conventional normal mode.

When the welding machine 200 does not detect that any plug-in module (analog plug-in module 103 or digital plug-in module 104) is inserted into the corresponding slot of the welding gun type identification circuit 102, or the analog plug-in module 103 originally inserted into the first slot or the digital plug-in module 104 originally inserted into the second slot is pulled out by the user, the welding machine 200 proposed in the present application will make the welding gun 300 work in the conventional normal mode, thereby realizing the control function of the welding gun 300 in the conventional normal mode. Specifically, when the welding machine 200 neither detects the analog plug-in module 103 inserted into the first slot nor the digital plug-in module 104 inserted into the second slot, the welding gun 300 will be controlled to work in the conventional normal mode. At this time, the welding gun 300 described in the present application is a conventional welding gun 300, which has the corresponding functions of the conventional welding gun 300.

Embodiment 4

Corresponding to the welding system 1000 disclosed in the first embodiment, the present application also proposes a welding gun control method implemented by the welding machine 200.

The welding machine 200 establishes an electrical signal connection with the welding gun 300 through a wire. The welding gun 300 includes a welding gun control circuit 100, and the welding gun control circuit 100 further includes a welding gun type identification circuit 102 installed in the welding gun handle, and an input circuit 101. The input circuit 101 has a first wire and a second wire for establishing an electrical signal connection between the welding machine 200 and the welding gun 300, and the welding gun type identification circuit 102 has a first slot for accommodating an analog plug-in module 103 and a second slot for accommodating a digital plug-in module 104. The welding gun control method includes the following steps:

Step S100, powering the welding gun 300 by utilizing the electrical signal connection between the welding machine 200 and the welding gun 300;

Step S200 , identifying the type of the welding gun 300 according to the electrical signal received from the welding gun 300 , obtaining a welding gun type identification result, and adaptively adjusting the specific function of the welding gun 300 according to the welding gun type identification result.

Further, FIG7 shows a specific implementation flow chart of the method steps for powering the welding gun 300 by utilizing the electrical signal connection established between the welding machine 200 and the welding gun 300. As shown in FIG7, step S100 further includes:

Step S101, filtering the power supply voltage signal provided by the welding machine 200 through the filtering sub-circuit 1011;

Step S102, rectifying the power supply voltage signal through the rectifier circuit 1012 to output a DC voltage;

Step S103, reading the average voltage value of the DC voltage output by the rectifier sub-circuit 1012 through the voltage stabilizing sub-circuit 1013;

Step S104, determining whether the average voltage value is lower than a preset DC voltage threshold; if so, executing step S106, if not, executing step S105;

Step S105 , interrupting the signal transmission between the input circuit 101 and the welding gun type identification circuit 102 , and returning to step S103 .

Step S106 , providing the DC voltage output by the rectifier circuit 1012 to the welding gun type identification circuit 102 .

From the above steps, it can be seen that the present application provides a voltage stabilization protection mechanism for the input circuit 101, which can temporarily interrupt the transmission when the power supply voltage signal provided by the welding machine 200 does not meet the set requirements, thereby avoiding the risk of causing the power supply voltage of the voltage stabilization subcircuit 1013. By adopting this voltage stabilization protection mechanism, the quality of the transmission signal of the input circuit 101 can be guaranteed, and the working stability of the input circuit 101 can be improved.

Furthermore, FIG8 shows a specific implementation flow chart of the welding gun type identification solution included in the welding gun control method of the present application. As shown in FIG8 , the above step S200 further includes:

Step S201, detecting whether an electrical signal from the welding gun type identification circuit 102 of the welding gun 300100 is received; if so, executing step S202, otherwise, executing step S203.

Step S202 , obtaining a first welding gun type identification result according to the received electrical signal and a pre-stored first correspondence table, identifying the welding gun 300 as a digital welding gun 300 , and switching to a digital control mode.

Step S203, check whether there is a resistance value between the first wire and the second wire. If there is a resistance value, execute step S204, otherwise, execute step S207.

Step S204: if it is detected whether there is a resistance value between the first wire and the second wire, the resistance value is read and it is determined that the resistance value is within the preset resistance value range. If it is determined that the measured resistance value is within the preset resistance value range, step S205 is executed, otherwise, step S206 is executed.

Step S205, if the resistance value is within the preset resistance value range, a table lookup is performed according to the measured resistance value and a pre-stored second correspondence table to obtain a second welding gun type identification result corresponding to the measured resistance value, and switch to the analog control mode.

Step S206 , confirming that the welding gun 300 does not belong to the category of a specific product model/series, not triggering the welding gun type identification operation of the welding gun 300 , and not performing the adaptive adjustment operation of the specific function of the welding gun 300 .

Step S207, controlling the welding gun 300 to operate in a conventional normal mode.

In summary, the improvements of the present application compared to the conventional welding gun 300 are at least reflected in the following aspects:

First, the welding machine 200 uses the first wire and the second wire to transmit the power supply voltage signal provided by the welding machine 200 to power the welding gun 300. In addition, the welding machine 200 also uses the communication function of the first wire and the second wire to receive and transmit electrical signals between the welding machine 200 and the welding gun 300. Therefore, there is no need to add additional wires or change the existing wire design. Therefore, the welding machine 200 is compatible with all types of welding guns 300.

Second, corresponding slots are set on the welding gun control circuit 100 so that the user can replace different intelligent control components (i.e., the analog plug-in module 103 and the digital plug-in module 104) so that the welding gun 300 has different functions. The present application 200 can trigger the identification of the welding gun type of the welding gun 300 according to the insertion conditions of the first slot and the second slot, obtain an accurate welding gun type identification result by looking up the table, and adaptively adjust the specific functions of the welding gun 300 according to the obtained welding gun type identification result. Therefore, the user can replace different intelligent control components according to the use needs to give the welding gun 300 different functions, so that the welding gun 300 works in any of the traditional common mode, analog control mode and digital control mode, and provide the user with functions corresponding to its working mode, thereby meeting the diverse needs of different users.

3. The welding machine 200 proposed in the present application has excellent compatibility. The welding machine 200 is not only compatible with various types of welding guns 300, but also can simultaneously identify three welding guns 300 connected to the welding machine 200.

Fourth, the welding gun 300 has a voltage stabilization protection mechanism. The voltage stabilization function provided by the voltage stabilization subcircuit 1013 of the input circuit 101 of the welding gun control circuit 100 can optimize the signal transmission between the welding machine 200 and the input circuit 101 of the welding gun control circuit 100 when the power supply voltage provided by the welding machine 200 is undervoltage, thereby ensuring that a stable operating voltage can be provided for the welding gun type identification circuit 102, thereby improving the working stability of the entire welding gun control circuit 100.

The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementations, which are merely illustrative and not restrictive. Under the guidance of the present application, a person of ordinary skill in the art can make many forms without departing from the scope of protection of the purpose of the present application and the claims, all of which are within the protection of the present application. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present application.

Claims

A welding system comprises a welding machine and a welding gun which establish an electrical signal connection, wherein the welding machine is used to power the welding gun by using two wires, i.e., a first wire and a second wire, to establish the electrical signal connection between the welding gun and the welding machine, and to identify the type of the welding gun according to the electrical signal received from the welding gun, thereby obtaining a welding gun type identification result, and adaptively adjust the specific function of the welding gun according to the welding gun type identification result.
The welding system according to claim 1, characterized in that the welding gun includes a welding gun control circuit, the welding gun control circuit includes a welding gun type identification circuit installed in the welding gun handle, and an input circuit connected between the welding gun type identification circuit and the welding machine;

The input circuit includes the first wire and the second wire for establishing the electrical signal connection between the welding gun and the welding machine; wherein one end of the first wire and the second wire are connected to the welding gun port for connecting to the welding machine, and the other end of the first wire and the second wire are connected to the input port of the input circuit.
The welding system according to claim 1, characterized in that the welding gun type identification circuit includes a first slot for accommodating an analog plug-in module and a second slot for accommodating a digital plug-in module;

The welding machine is specifically used to trigger an identification operation of a welding gun type of the welding gun according to the insertion status of the first slot and the second slot, obtain a welding gun type identification result by looking up a table, and adaptively adjust a specific function of the welding gun according to the welding gun type identification result.
The welding system according to claim 3 is characterized in that the welding machine is specifically used for:

checking whether an electrical signal from the welding gun type identification circuit is received;

If the electrical signal from the welding gun type identification circuit is received, a first welding gun type identification result is obtained according to the electrical signal and a pre-stored first correspondence table, the welding gun is identified as a digital welding gun, and the welding gun is switched to a digital control mode;

If no electrical signal is received from the welding gun type identification circuit, it is checked whether there is a resistance value between the first wire and the second wire, and the resistance value between the first wire and the second wire is read; if the resistance value between the first wire and the second wire is read, and the resistance value is within a preset resistance value range, a table lookup is performed according to the measured resistance value and a pre-stored second correspondence table to obtain a second welding gun type identification result corresponding to the measured resistance value, and the analog control mode is switched; if the resistance value between the first wire and the second wire is read, and it is confirmed that the resistance value exceeds the preset resistance value range, it is confirmed that the welding gun does not belong to the category of a specific product model/series, and the identification operation of the welding gun type of the welding gun is not triggered, and the adaptive adjustment operation of the specific function of the welding gun is not performed;

The second correspondence table includes a one-to-one correspondence between the resistance value between the first wire and the second wire and various simulated welding gun types.
The welding system according to claim 3 is characterized in that the welding machine is also used to identify the welding gun as an ordinary welding gun when neither the analog plug-in module inserted into the first slot nor the digital plug-in module inserted into the second slot is detected, so that the welding gun operates in a traditional ordinary mode.
The welding system according to claim 2 is characterized in that the welding gun type identification circuit has a first slot for accommodating an analog plug-in module and a second slot for accommodating a digital plug-in module, and is used to have the function of being identified by the welding machine through the electrical signal between the first wire and the second wire when the analog plug-in module inserted into the first slot is detected or the digital plug-in module inserted into the second slot is detected.
The welding system according to claim 2, characterized in that the input circuit comprises:

A filter subcircuit, the filter subcircuit is used to filter the power supply voltage signal provided by the welding machine;

A rectifier circuit, the rectifier circuit is used to rectify the power supply voltage signal and output a DC voltage;

A voltage stabilizing subcircuit, the voltage stabilizing subcircuit is used to read an average voltage value of the DC voltage output by the rectifier subcircuit, determine whether the average voltage value reaches a preset DC voltage threshold, and interrupt the voltage signal transmission between the input circuit and the welding gun type identification circuit when the average voltage value is lower than the preset DC voltage threshold; the voltage stabilizing subcircuit is also used to resume the voltage signal transmission between the input circuit and the welding gun type identification circuit when it is detected that the DC voltage output by the rectifier subcircuit reaches the preset DC voltage threshold again;

A key sub-circuit is connected to a welding gun switch through the first wire and the second wire.
A welding machine, characterized in that the welding machine establishes an electrical signal connection with a welding gun through a first wire and a second wire, and the welding machine is used to power the welding gun through the electrical signal connection and identify the type of the welding gun according to the electrical signal received from the welding gun, obtain a welding gun type identification result, and adaptively adjust the specific function of the welding gun according to the welding gun type identification result.
The welding machine according to claim 8, characterized in that one end of the first wire and the second wire are both connected to a welding gun port for connecting to the welding machine, and the other ends of the first wire and the second wire are both connected to an input circuit of the welding gun.
The welding machine according to claim 8 is characterized in that the welding machine is specifically used to trigger an identification operation of a welding gun type of the welding gun according to the insertion status of the first slot and the second slot of the welding gun, obtain a welding gun type identification result by looking up a table, and adaptively adjust the specific function of the welding gun according to the welding gun type identification result.
The welding machine according to claim 10 is characterized in that the welding machine is specifically used for:

checking whether an electrical signal from the welding gun is received;

If the electrical signal from the welding gun type is received, a first welding gun type identification result is obtained according to the electrical signal and a pre-stored first correspondence table, the welding gun is identified as a digital welding gun, and the control mode is switched to a digital control mode;

If no electrical signal from the welding gun is received, it is checked whether there is a resistance value between the first wire and the second wire, and the resistance value between the first wire and the second wire is read; if the resistance value between the first wire and the second wire is read, and it is determined that the resistance value is within a preset resistance value range, a table lookup is performed according to the measured resistance value and a pre-stored second correspondence table to obtain a second welding gun type identification result corresponding to the measured resistance value, and the control mode is switched to an analog control mode; if the resistance value between the first wire and the second wire is read, and it is confirmed that the resistance value exceeds the preset resistance value range, it is confirmed that the welding gun does not belong to a welding gun within the scope of a specific product model/series, and the identification operation of the welding gun type of the welding gun is not triggered, and the adaptive adjustment operation of the specific function of the welding gun is not performed;

The second correspondence table includes a one-to-one correspondence between the resistance value between the first wire and the second wire and various simulated welding gun types.
The welding machine according to claim 10 is characterized in that the welding machine is also used to identify the welding gun as a normal welding gun when neither the analog plug-in module inserted into the first slot of the welding gun nor the digital plug-in module inserted into the second slot of the welding gun is detected, so that the welding gun operates in a traditional normal mode.
A welding gun, including but not limited to a MIG welding gun, a TIG welding gun, a push-pull welding gun, a cutting torch, the welding gun comprising a welding gun control circuit, characterized in that the welding gun control circuit comprises a welding gun type identification circuit installed in a welding gun handle, and an input circuit connected between the welding gun type identification circuit and a welding machine;

Wherein, the input circuit includes a first wire and a second wire for establishing an electrical signal connection between the welding gun and the welding machine;

The welding gun type identification circuit has a first slot for accommodating an analog plug-in module and a second slot for accommodating a digital plug-in module, and is used to be identified by the welding machine through an electrical signal between the first wire and the second wire when the analog plug-in module inserted into the first slot is detected or the digital plug-in module inserted into the second slot is detected.
The welding gun according to claim 13, characterized in that one end of the first wire and the second wire are both connected to a welding gun port for connecting to the welding machine, and the other ends of the first wire and the second wire are both connected to an input port of the input circuit.
The welding gun according to claim 13, characterized in that the welding gun type identification circuit also has an interface electrically connected to the analog plug-in module inserted into the first slot or the digital plug-in module inserted into the second slot.
A welding gun control method, wherein the welding gun control method is implemented on a welding machine, the welding gun comprises a welding gun control circuit, the welding gun control circuit comprises a welding gun type identification circuit installed in a welding gun handle, and an input circuit, the input circuit has a first wire and a second wire for establishing an electrical signal connection between the welding machine and the welding gun, the welding gun type identification circuit has a first slot for accommodating an analog plug-in module and a second slot for accommodating a digital plug-in module; characterized in that the method comprises the following steps:

The welding gun is powered by utilizing the electrical signal connection established between the welding machine and the welding gun and the type of the welding gun is identified according to the electrical signal received from the welding gun, thereby obtaining a welding gun type identification result, and adaptively adjusting the specific function of the welding gun according to the welding gun type identification result.
The welding gun control method according to claim 16 is characterized in that the step of identifying the type of the welding gun according to the electrical signal received from the welding gun, obtaining a welding gun type identification result, and adaptively adjusting the specific function of the welding gun according to the welding gun type identification result comprises:

When the analog plug-in module inserted into the first slot is detected or the digital plug-in module inserted into the second slot is detected, triggering an identification operation of the welding gun type of the welding gun, and obtaining a welding gun type identification result by looking up a table;

The specific functions of the welding gun are adaptively adjusted according to the welding gun type identification result.
The welding gun control method according to claim 17 is characterized in that when the analog plug-in module inserted into the first slot is detected or the digital plug-in module inserted into the second slot is detected, the welding gun type identification operation of the welding gun is triggered, the welding gun type identification result is obtained by looking up a table, and the specific function of the welding gun is adaptively adjusted according to the welding gun type identification result. The steps specifically include:

checking whether an electrical signal from the welding gun type identification circuit is received;

If the electrical signal from the welding gun type identification circuit is received, a first welding gun type identification result is obtained according to the electrical signal and a pre-stored first correspondence table, the welding gun is identified as a digital welding gun, and the welding gun is switched to a digital control mode;

If no electrical signal is received from the welding gun type identification circuit, it is checked whether there is a resistance value between the first wire and the second wire, and the resistance value between the first wire and the second wire is read; if the resistance value between the first wire and the second wire is read, and the resistance value is within a preset resistance value range, a table lookup is performed according to the measured resistance value and a pre-stored second correspondence table to obtain a second welding gun type identification result corresponding to the measured resistance value, and the analog control mode is switched; if the resistance value between the first wire and the second wire is read, and it is confirmed that the resistance value exceeds the preset resistance value range, it is confirmed that the welding gun does not belong to the category of a specific product model/series, and the identification operation of the welding gun type of the welding gun is not triggered, and the adaptive adjustment operation of the specific function of the welding gun is not performed;

The second correspondence table includes a one-to-one correspondence between the resistance value between the first wire and the second wire and various simulated welding gun types.
The welding gun control method according to claim 16 is characterized in that the step of identifying the type of the welding gun according to the electrical signal received from the welding gun to obtain a welding gun type identification result, and adaptively adjusting the specific function of the welding gun according to the welding gun type identification result further comprises:

If neither the analog plug-in module inserted into the first slot and electrically connected to the welding gun type identification circuit nor the digital plug-in module inserted into the second slot and electrically connected to the welding gun type identification circuit is detected, the welding gun is operated in the traditional normal mode.
The welding gun control method according to claim 16, characterized in that the step of powering the welding gun through the electrical signal connection comprises:

Performing filtering processing on the power supply voltage signal provided by the welding machine through the filtering subcircuit of the input circuit;

Rectifying the power supply voltage signal through the rectifier circuit of the input circuit to output a DC voltage; and

The average voltage value of the DC voltage output by the rectifier subcircuit is read by the voltage stabilizing subcircuit of the input circuit to determine whether the average voltage value reaches a preset DC voltage threshold value, and when the average voltage value is lower than the preset DC voltage threshold value, the voltage signal transmission between the input circuit and the welding gun type identification circuit is interrupted until it is detected that the DC voltage output by the rectifier subcircuit reaches the preset DC voltage threshold value again, and the voltage signal transmission between the input circuit and the welding gun type identification circuit is restored.